Question

Geometrical isomers are differ in 

• A. Poisition of functional group
• B. Position of atoms
• C. Spatial arrangement of atoms
• D. Length of carbon chain

Answer 1

The Correct Option is C

Geometrical isomerism is a concept in stereochemistry that deals with compounds having the same molecular formula but differing in the spatial arrangement of groups around a double bond, ring, or any other fixed structure. Let's analyze the given options:

1. Position of functional group: This refers to how functional groups are placed within the molecule. It is characteristic of structural isomerism, not geometrical isomerism.
2. Position of atoms: While geometrical isomerism involves the placement of atoms, this option is too broad and does not specifically describe the spatial aspect.
3. Spatial arrangement of atoms: Correct! Geometrical isomers differ due to the different spatial arrangements of atoms or groups around a double bond (cis/trans isomers) or ring structure. This is the defining feature of geometrical isomerism.
4. Length of carbon chain: This parameter affects isomers called chain isomers, which are part of structural isomerism, not geometrical isomerism.

Therefore, the correct answer is Spatial arrangement of atoms. Geometrical isomers exhibit differences in physical and sometimes chemical properties because of the distinct spatial distribution of groups within the molecule.